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3 years ago

1. Which type of heat transfer, caused by uneven heating, moves air and water

Chemistry

1 answer:

neonofarm [45]3 years ago

4 0

Answer:

Convection

Explanation:

Convection is the transport of heat by a fluid like air or water.

Hot air is less dense than cold air, so hot air rises and cold air sinks.

In weather, convection refers to the vertical transfer of heat and moisture from the surface to a cooler area aloft.

Conduction is wrong. It involves the movement of heat by collision of molecules.

Radiation is wrong. It does not need a medium to transfer the heat.

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Which is the most accurate description of ionic and covalent bonding?

Yuliya22 [10]

Ionic Bonding:
This type of bonding occurs when atoms want to fulfil their valence shells by taking/giving electrons to other atoms. This, leads to completed valence shells in most cases and ionisation of both elements. The opposite charges cause the elements to stick together because opposites attract.

Covalent Bonding:
This type of bonding occurs when electrons are shared between atoms to each fill up their own valence shells by sharing. The balance between the attraction forces and repulsion forces between the shared electrons is called covalent bonding.

Hope I helped :)

6 0

3 years ago

How many grams of iron metal do you expect to be produced when 305 grams of a 75.5 percent by mass iron(II) nitrate solution rea

lutik1710 [3]

The balanced chemical reaction is:

2 Al (s) + 3 Fe(NO3)2 (aq) = 3 Fe (s) + 2 Al(NO3)2 (aq)

The ratios or the coefficients between the reactants and the products will be used for further calculations.

305 g Fe(NO3)2 solution (.755) = 230.275 g Fe(NO3)2

 230.275 g Fe(NO3)2 ( 1mol / 179.87 g) ( 3 mol Fe / 3 mol Fe(NO3)2) ( 55.85 g / mol) = 71.500 g Fe

4 0

3 years ago

Read 2 more answers

If the percent yield for the following reaction is 75.0%, and 25.0 g of NO₂ are consumed in the reaction, how many grams of nitr

victus00 [196]

Answer:

17.1195 grams of nitric acid are produced.

Explanation:

$3NO_2+H_2O\rightarrow 2HNO_3+NO$

Moles of nitrogen dioxide :

$\frac{25.0 g}{56 g/mol}=0.5434 mol$

According to reaction 3 moles of nitrogen dioxides gives 2 moles of nitric acid.

Then 0.5434 moles of nitrogen dioxides will give:

$\frac{2}{3}\times 0.5434 mol=0.3623 mol$ of nitric acid.

Mass of 0.3623 moles of nitric acid :

$0.3623 mol\times 63 g/mol=22.8260 g$

Theoretical yield = 22.8260 g

Experimental yield = ?

$\%Yield=\frac{\text{Experimental yield}}{\text{theoretical yield}}\times 100$

$75\%=\frac{\text{Experimental yield}}{22.8260 g}$

Experimental yield of nitric acid = 17.1195 g

7 0

4 years ago

What is the molarity of a solution which has a volume of 3 litres and contains 5.1 moles of Br2?

katrin [286]

Answer:

The molarity of the solution is 1.7 $\frac{moles}{liter}$ .

Explanation:

Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$Molarity=\frac{moles of solute}{volume of the solute}$

Molarity is expressed in units $\frac{moles}{liter}$ .

In this case, you know:

moles of solute= 5.1
volume= 3 L

Replacing:

$Molarity=\frac{5.1 moles}{3 L}$

Solving:

Molarity= 1.7 $\frac{moles}{liter}$

The molarity of the solution is 1.7 $\frac{moles}{liter}$ .

4 0

3 years ago

A sound is first produced by making something BLANK . The sound then travels through a BLANK to reach the ears, which are the pa

Alexandra [31]

A sound is first produced by making something VIBRATE. The sound then travels through a MEDIUM to reach the ears, which are the parts of the body that allow for sounds to be heard.

3 0

3 years ago